British Standard Specification for Machine Cut Gears
Published the British Standards Institution in 1940. No. 436. HC without DJ. Coth cover with some discolouration front and back. An Interim Corrigendum is taped (although the tape has detached) to the front endpaper. This has caused discolouration. There is an inscription on the front endpaper. Some charts have been removed from the back of the book.